AP_relay: added default relay pin for VRBRAIN
VRBRAIN: added startup of internal mag's driver for VR Brain Standard 5
AP_HAL: VRBRAIN corrected EEPROM size and added terrain folder on MicroSD
AP_HAL_VRBRAIN: enable 2nd GPS for VRBRAIN 5
Build: VRBRAIN corrected order of MAG startup
Build: VRBRAIN corrected order of MAG startup for 4.5 board
Copter: AC3.2-rc6 release notes
Copter: update AC3.2-rc6 release notes

Forgot to add GPS driver buffer overflow item
Copter: update AC3.2-rc6 release notes

forgot compass-not-calibrated bug fix
Copter: minor format change to release notes

This also helps kick off the rebuild so AC3.2-rc6 appears in the mission
planner
InertialNav: add credit to Tony Lambregts
Copter: move drift thr assist to separate function

no changes in functionality.
Copter: sanity check throttle deadzone
InertialSensor: reorder .cpp file to match .h

No functional changes
INS: add get_accel_health_all and get_gyro_health_all

Returns true only if all available accels or gyros are healthy
Copter: check all gyros and accels in pre-arm check
Copter: individual accel and gyro status to GCS
Plane: individual accel and gyro status to GCS
Rover: individual accel and gyro status to GCS
AP_Mission: make cmd.p1 be radius on plane for NAV_WAYPOINT